10 files changed, 75 insertions, 28 deletions

diff --git a/arch/Kconfig b/arch/Kconfig
index d82875820a15..9d055b4f0585 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -135,9 +135,7 @@ config HAVE_DEFAULT_NO_SPIN_MUTEXES
 
 config HAVE_HW_BREAKPOINT
         bool
-        depends on HAVE_PERF_EVENTS
-        select ANON_INODES
-        select PERF_EVENTS
+        depends on PERF_EVENTS
 
 config HAVE_USER_RETURN_NOTIFIER
         bool
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 3b2a5aca4edb..55298e891571 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -50,6 +50,8 @@ config X86
         select HAVE_KERNEL_BZIP2
         select HAVE_KERNEL_LZMA
         select HAVE_HW_BREAKPOINT
+        select PERF_EVENTS
+        select ANON_INODES
         select HAVE_ARCH_KMEMCHECK
         select HAVE_USER_RETURN_NOTIFIER
 
diff --git a/arch/x86/include/asm/stacktrace.h b/arch/x86/include/asm/stacktrace.h
index cf86a5e73815..35e89122a42f 100644
--- a/arch/x86/include/asm/stacktrace.h
+++ b/arch/x86/include/asm/stacktrace.h
@@ -5,6 +5,29 @@ extern int kstack_depth_to_print;
 
 int x86_is_stack_id(int id, char *name);
 
+struct thread_info;
+struct stacktrace_ops;
+
+typedef unsigned long (*walk_stack_t)(struct thread_info *tinfo,
+                                      unsigned long *stack,
+                                      unsigned long bp,
+                                      const struct stacktrace_ops *ops,
+                                      void *data,
+                                      unsigned long *end,
+                                      int *graph);
+
+extern unsigned long
+print_context_stack(struct thread_info *tinfo,
+                    unsigned long *stack, unsigned long bp,
+                    const struct stacktrace_ops *ops, void *data,
+                    unsigned long *end, int *graph);
+
+extern unsigned long
+print_context_stack_bp(struct thread_info *tinfo,
+                       unsigned long *stack, unsigned long bp,
+                       const struct stacktrace_ops *ops, void *data,
+                       unsigned long *end, int *graph);
+
 /* Generic stack tracer with callbacks */
 
 struct stacktrace_ops {
@@ -14,6 +37,7 @@ struct stacktrace_ops {
         void (*address)(void *data, unsigned long address, int reliable);
         /* On negative return stop dumping */
         int (*stack)(void *data, char *name);
+        walk_stack_t    walk_stack;
 };
 
 void dump_trace(struct task_struct *tsk, struct pt_regs *regs,
diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index 45506d5dd8df..c223b7e895d9 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -2336,6 +2336,7 @@ static const struct stacktrace_ops backtrace_ops = {
         .warning_symbol         = backtrace_warning_symbol,
         .stack                  = backtrace_stack,
         .address                = backtrace_address,
+        .walk_stack             = print_context_stack_bp,
 };
 
 #include "../dumpstack.h"
diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c
index 0a0aa1cec8f1..c56bc2873030 100644
--- a/arch/x86/kernel/dumpstack.c
+++ b/arch/x86/kernel/dumpstack.c
@@ -109,6 +109,30 @@ print_context_stack(struct thread_info *tinfo,
         }
         return bp;
 }
+EXPORT_SYMBOL_GPL(print_context_stack);
+
+unsigned long
+print_context_stack_bp(struct thread_info *tinfo,
+                       unsigned long *stack, unsigned long bp,
+                       const struct stacktrace_ops *ops, void *data,
+                       unsigned long *end, int *graph)
+{
+        struct stack_frame *frame = (struct stack_frame *)bp;
+        unsigned long *ret_addr = &frame->return_address;
+
+        while (valid_stack_ptr(tinfo, ret_addr, sizeof(*ret_addr), end)) {
+                unsigned long addr = *ret_addr;
+
+                if (__kernel_text_address(addr)) {
+                        ops->address(data, addr, 1);
+                        frame = frame->next_frame;
+                        ret_addr = &frame->return_address;
+                        print_ftrace_graph_addr(addr, data, ops, tinfo, graph);
+                }
+        }
+        return (unsigned long)frame;
+}
+EXPORT_SYMBOL_GPL(print_context_stack_bp);
 
 
 static void
@@ -141,10 +165,11 @@ static void print_trace_address(void *data, unsigned long addr, int reliable)
 }
 
 static const struct stacktrace_ops print_trace_ops = {
-        .warning = print_trace_warning,
-        .warning_symbol = print_trace_warning_symbol,
-        .stack = print_trace_stack,
-        .address = print_trace_address,
+        .warning                = print_trace_warning,
+        .warning_symbol         = print_trace_warning_symbol,
+        .stack                  = print_trace_stack,
+        .address                = print_trace_address,
+        .walk_stack             = print_context_stack,
 };
 
 void
diff --git a/arch/x86/kernel/dumpstack.h b/arch/x86/kernel/dumpstack.h
index 81086c227ab7..4fd1420faffa 100644
--- a/arch/x86/kernel/dumpstack.h
+++ b/arch/x86/kernel/dumpstack.h
@@ -14,12 +14,6 @@
 #define get_bp(bp) asm("movq %%rbp, %0" : "=r" (bp) :)
 #endif
 
-extern unsigned long
-print_context_stack(struct thread_info *tinfo,
-                unsigned long *stack, unsigned long bp,
-                const struct stacktrace_ops *ops, void *data,
-                unsigned long *end, int *graph);
-
 extern void
 show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
                 unsigned long *stack, unsigned long bp, char *log_lvl);
diff --git a/arch/x86/kernel/dumpstack_32.c b/arch/x86/kernel/dumpstack_32.c
index e0ed4c7abb62..ae775ca47b25 100644
--- a/arch/x86/kernel/dumpstack_32.c
+++ b/arch/x86/kernel/dumpstack_32.c
@@ -58,7 +58,7 @@ void dump_trace(struct task_struct *task, struct pt_regs *regs,
 
                 context = (struct thread_info *)
                         ((unsigned long)stack & (~(THREAD_SIZE - 1)));
-                bp = print_context_stack(context, stack, bp, ops, data, NULL, &graph);
+                bp = ops->walk_stack(context, stack, bp, ops, data, NULL, &graph);
 
                 stack = (unsigned long *)context->previous_esp;
                 if (!stack)
diff --git a/arch/x86/kernel/dumpstack_64.c b/arch/x86/kernel/dumpstack_64.c
index b13af53883aa..0ad9597073f5 100644
--- a/arch/x86/kernel/dumpstack_64.c
+++ b/arch/x86/kernel/dumpstack_64.c
@@ -188,8 +188,8 @@ void dump_trace(struct task_struct *task, struct pt_regs *regs,
                         if (ops->stack(data, id) < 0)
                                 break;
 
-                        bp = print_context_stack(tinfo, stack, bp, ops,
-                                                 data, estack_end, &graph);
+                        bp = ops->walk_stack(tinfo, stack, bp, ops,
+                                             data, estack_end, &graph);
                         ops->stack(data, "<EOE>");
                         /*
                          * We link to the next stack via the
diff --git a/arch/x86/kernel/stacktrace.c b/arch/x86/kernel/stacktrace.c
index c3eb207181fe..922eefbb3f6c 100644
--- a/arch/x86/kernel/stacktrace.c
+++ b/arch/x86/kernel/stacktrace.c
@@ -53,17 +53,19 @@ save_stack_address_nosched(void *data, unsigned long addr, int reliable)
 }
 
 static const struct stacktrace_ops save_stack_ops = {
-        .warning = save_stack_warning,
-        .warning_symbol = save_stack_warning_symbol,
-        .stack = save_stack_stack,
-        .address = save_stack_address,
+        .warning        = save_stack_warning,
+        .warning_symbol = save_stack_warning_symbol,
+        .stack          = save_stack_stack,
+        .address        = save_stack_address,
+        .walk_stack     = print_context_stack,
 };
 
 static const struct stacktrace_ops save_stack_ops_nosched = {
-        .warning = save_stack_warning,
-        .warning_symbol = save_stack_warning_symbol,
-        .stack = save_stack_stack,
-        .address = save_stack_address_nosched,
+        .warning        = save_stack_warning,
+        .warning_symbol = save_stack_warning_symbol,
+        .stack          = save_stack_stack,
+        .address        = save_stack_address_nosched,
+        .walk_stack     = print_context_stack,
 };
 
 /*
diff --git a/arch/x86/oprofile/backtrace.c b/arch/x86/oprofile/backtrace.c
index 044897be021f..3855096c59b8 100644
--- a/arch/x86/oprofile/backtrace.c
+++ b/arch/x86/oprofile/backtrace.c
@@ -41,10 +41,11 @@ static void backtrace_address(void *data, unsigned long addr, int reliable)
 }
 
 static struct stacktrace_ops backtrace_ops = {
-        .warning = backtrace_warning,
-        .warning_symbol = backtrace_warning_symbol,
-        .stack = backtrace_stack,
-        .address = backtrace_address,
+        .warning        = backtrace_warning,
+        .warning_symbol = backtrace_warning_symbol,
+        .stack          = backtrace_stack,
+        .address        = backtrace_address,
+        .walk_stack     = print_context_stack,
 };
 
 struct frame_head {